1157136181 has 2 divisors, whose sum is σ = 1157136182. Its totient is φ = 1157136180.

The previous prime is 1157136173. The next prime is 1157136209. The reversal of 1157136181 is 1816317511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643433956 + 513702225 = 25366^2 + 22665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157136181 - 2³ = 1157136173 is a prime.

It is a super-2 number, since 2×1157136181² = 2677928282758529522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157136131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578568090 + 578568091.

It is an arithmetic number, because the mean of its divisors is an integer number (578568091).

Almost surely, 2^1157136181 is an apocalyptic number.

It is an amenable number.

1157136181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157136181 is an equidigital number, since it uses as much as digits as its factorization.

1157136181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 1157136181 is about 34016.7044406127. The cubic root of 1157136181 is about 1049.8521881121.

The spelling of 1157136181 in words is "one billion, one hundred fifty-seven million, one hundred thirty-six thousand, one hundred eighty-one".